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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166e38566db368eb2d840728064ccddab4b92292b51410fb222bbe34d00be83e' 
  AND token = 'XsY80Fe7dZG9Qw2YT7J1SDhknTy2NaLDIOaVcR3D7kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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