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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e655ff62d79162db39dfbbb68852adbebb98c64841e25082431681616b1dbd24' 
  AND token = 'XhUgM8tXdT4bDFR9E/Tv3QRC5WbJBzzPAx1Z18xqvyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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