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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0303a85c5789e6c053bb05552600918b6e32315a75de5270d3c5f5da0c0c0e45' 
  AND token = 'ijcnszj14HJQb99mSUGBMNYrKa2v7ge7mo5ExD35Bp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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