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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceef20abb888557add014c781eec203a730a41f2d0175cdb92df4b0c79e8036e' 
  AND token = 'C56Ml0AqfYl2ANRVX/JLF9IBSU4rPgoc+xWZvfP8j5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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