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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c21b4e370c4ca607c8b9b5796794f840169d6b96306fb62e997c7966b2435c' 
  AND token = 'oT6boFlcYXW13tQhexnYUmGqEl3Dh/U4eezD53z3vkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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