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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2f34cf8c3fc54568bf3de3ebf4e86f69f1ff8641614dc76fea9bad7278b9d3' 
  AND token = '0SKDukIUi6esQ10BdBXkEv6XskVL7SSBJ3FgMPqP7rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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