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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abe3cef500c9d0195befe8e7f4b1bcb71fa89edae6e2f70b1f582877f2501ba' 
  AND token = '3awy+/oMHfgg1YyFulo60ifD/ljFfMmqzT8EKpsiXVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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