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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a540f8f88c1a5387f9fc7ab0e2e67f55b0c66feac65cbea1fac646ba79f73af2' 
  AND token = 'OEy64HC54VwiBU+2c4431uflp6ziQonLjqHKr8mf8Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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