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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae27f3f9054c52d3bac2bda82a173a35023c728ff217366126eb7e77836c4eb' 
  AND token = '4xQ8zDJvb6mcLfXCFYZHiq9jk6X5eomDcTuNR8SAhV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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