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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84eff4edaa3ffa3297dab5deb3f2fd927a7607b6e51208c9af309c40c371bd37' 
  AND token = 'MQI/XWyWPMzhHn3cRhtik5rrpIhbshfd20GoakuqHt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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