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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf17115637bc4e4f593410db4fa7d6d76b8cfabfff7fed131a17e8ca0a6686d' 
  AND token = 'PiifJqgCRGGXNDBBB8f+7m/l28+/ScPK8nOF2bDnp+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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