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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b78c2c92221ef22792a0c3c99fa059db543ada45676efd9b3be7b039c00c1a' 
  AND token = '6A+kaH2Km1bciemuzyNvjtsdqMM1gl1+W6e80p3dEPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}