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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2d199683c057813af1efa4427abd21d411ad97f556bf47c9ca4ee1ab3211f3' 
  AND token = 'pxtZ7V4GIW5d275RW6ZK4QjudnDhCPLyDvos1okE4zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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