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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c70d6ecbdf1fb750982a8332e6892ff4da968c7903ec337f0a4084cecc33df' 
  AND token = '9rxD89H2Ra6NdvMXInHI4v2fvEyDFxK+ILNVHoaC6+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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