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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dc49a072c177d7feb5270ae78709c5bc28fb3a1dffe4445b3d37884fdb0080' 
  AND token = '91ZUp1g5jjQRoQKG128YP2PTJk7cOI5aD4xFe9VdBK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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