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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88020667fbf7a0dcfe6806c3e9447e4e961bd2857eecc841c90840f335678eb5' 
  AND token = 'MfyfYyEv1MqRebS+OE5rBEEYsxPqYfaOHc1aIGAqjys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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