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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3f3927471ec17bfb5f1bc62cb387b99d444f620150f73e1a7704dfb964b7bb' 
  AND token = 'XZ5aOll6FjpghpU5ALTTz6ASw3G/2WkX7HnyD9VBa1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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