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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005aa890cd2830d3ba2221909a03d1e72d830b898cce4b5048a77fe288c1e40d' 
  AND token = 'NYz5NUoDDwu5fcBp94vJVwzrZthFzOWu0ulGLQnjWB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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