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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98842284c2f8bc24705f5f857990e87ede5a821743ecc5eece62d17eed24ccb2' 
  AND token = 'Yij+L6Shz7TNvbT3Fz+DAEwxIEr6kDjN/oW9nzUxk5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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