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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6da697ba7e0976b8bf912c79efa8cfd46ef3e848d5def2a2b9ea8108e99e80' 
  AND token = '1r2QbeaG2kQs+U7kSvTMpBfqUaT6GxsObsl77huoc/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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