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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1418d2f601e3d67546a74183f0b0f7b644d4476d431f3da17c2d1ac5430ec2b5' 
  AND token = 'hKzg9nH3tAWppcA5t4c+blnMj1EpjvSvvgUclLCfrhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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