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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c5fbe24f9eb0b1cbdd1e76c6949d50b09907b0fd2c8dc7c119c41aa1254d88' 
  AND token = '2MNAhxahF9kM41rcQjJXwWnxCLf9/9MU176YKPXSlBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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