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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2880766a94620533a3e38393db97e3940f1688023b7456c2ed386fc50db14a30' 
  AND token = 'f03+5ajFVpHo51h7wHGgnZ3EZnsWKXB5EYSVXFe+V9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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