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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dd8f800a481c4c13ca01ecf173669b068ee929945c156d3f972255723f4c67' 
  AND token = 'G0L4qQSfPZPjetb7cqsDo91nRJ//ApnNYz0Nl2Rz7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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