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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d76ecb515838b6ad5d8f1a49fbe4ebbda4f3d1a60ccb6731b449997f287cca7' 
  AND token = 'ufIg6rk8jBplN/g4I07Hc0/OMWC4obggQ7T8mm6rYOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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