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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab4a5f62f5c930b7639c46a661c7c5d49c4067d2245f44357c0e827c98af75d' 
  AND token = 'RU5kVpIvX+xSWviE3NREIhtdUZPZFpZc7YD0swm2ufA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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