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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5890b6a9870de4aa97c1634fd9d7467e4637ecb3262902d28ffb34cbc9005bfb' 
  AND token = 'mK+H2g05UYGmi6rZc9NcAL5bH8OVCAC5tXBeld2Sopo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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