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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b810534e3d2210584a25c2087320fdfc6ebb8a98cce41ca869733c6f349547a4' 
  AND token = 'gs1iijlbp0P8ddxHSc7C4prm+X3xhI4TIRbRQVCHDE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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