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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05520dbf713c21069373946721c1412c03ec47675450b1d432e38459f35ac75' 
  AND token = 'SLEgms7So0sVFvlGnLyI2NJ0Bmopez6V34STo8uZ5Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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