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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b66010e5bef7e227b2aafc4b5b50caa404693026dbea1f847ded6f4e95c48a' 
  AND token = 'LqN3fgjPNsFyoDpUaEe6Ujj+UK4CP8rG+exzMxC67mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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