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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01c934d00b111ccee69912b41fea78519992031a3e12a3d29509df203e5f702' 
  AND token = 'GeO4b8D8MQPRNN5yy+E1UK1naI49w2S1TP625lThIoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00287

JSON explain

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