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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f733ee60657e6cf7f85c0e1acc5e97f7613f1dc811f5bf521ad9041bfcfa364c' 
  AND token = 'I2YILdC58SMRBvksxlX2iUA8siQ+/BI/GwcBd/uc+kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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