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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca578d732c66577ffcd403e58c76f5a8574b41e6f02c392788cb60e3d3859d3' 
  AND token = 'geUtagAf0ANdWTjHcwzwcNKcOc2mRTAfqFxZe67s1QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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