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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbc1501a1a126af5fd58a1879432da3bedf58b75e2e11137c4bfa6fd3c8a387' 
  AND token = 'QWfb7drBL6AxPWu1614rtOJPBKi/Ywhdy+xS7F91O8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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