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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e403d5c5654e6ae78c1bafe7b6b33b96c852bf3016c41edee9069d1bfa7665' 
  AND token = 'A5Z7W0nVVXXcLmYMyL5T1p+eg82v5GjM0y61y4SkUMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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