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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5fed959bbfdbbcf0331a347fc19d4bdbeeddb59bf9cbe15c87ca4a8b24be33' 
  AND token = 'aZtfgNLf7Kmrf+KR25OZFQsRMHdCd9TcyQRVX2iS7fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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