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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f6cdc799bf7bfeebb0ef09bd4d244e9848e938e104bba8d1069b83851cdff3' 
  AND token = '6QDUBCGENNVogtMC5ljKqUExkWM+vI+O/Aw3dXNYSoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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