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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098b500d2e6b9f2c20f7045238097ab38a8b3088ffa725676f53b19a2116c926' 
  AND token = 'uTQan0MwvWmWNtklEN6pFLE+WyuZo4aNIYx7QLp4lm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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