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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19330e6c17986dbdbb7f0d6c686fc2e6bced39789f148eb94c21fd15d3b5190d' 
  AND token = 'eRtglg9F4sXiQFS1M1iXM1GlXRJQeCfnYCtwS5f7l10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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