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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d4e8c217a07d69c45c1136b2de2139da0b19224851eb1b478ee0b00dbf7542' 
  AND token = 'u+zcUQqmcKu1grawav19Nua3+hIx0EkifY1AtN2R8qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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