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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7c4b7f64b632c7731326d7aa98ea9587238075e003e560c3f0569849164bf2' 
  AND token = '64wVH7Kxn3JtYbQul4Dhc+BdGgMO/KNR2N29rrauyr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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