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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba6a52b832863227b83b6f8c0edcdf386487e59f7cc6b79a9b9ebd7ede5de5a' 
  AND token = 'sbBvFJSDSYb0OnddvKqIRvJxNzMqOnWwhpD+yA49TeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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