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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315ab0004a1e24d52d3226e40b77e7261b91a51b7c7b0bbb47e4e9619129bbc1' 
  AND token = 'lcaGs59QUzGIj6Eh4k2y8hsd72n/GT9qforL/7YB7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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