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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d330a60bf2b3374b33d1cfe95cd4ef18b10ca2ccca66d71d82f856364667561' 
  AND token = 'Fjg3ir3DyP18HWohHf5oWoUthG9ZGhTScjz/0p1VnNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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