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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3da31570dd22a620faab397746341090b8171d1714927d0295ae2b33b18353f' 
  AND token = 'vFCGXxYfYVyNzb948ORlo059M/532M06xD1z5Dk40Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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