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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84444ba9fbedf3336b0f94cc5319b7eb920472c1d582b3a861b1c25d3d219b5' 
  AND token = '5gGLor3VTr243/YquHe6YSUYj+ueCUTDEjA55UXqw94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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