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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71826b3bbd538d3a07efb837038e3cd4dd2ec854a62eee5cdccfce2d5ff02afb' 
  AND token = 'k4g7BSrK0aJy4L/W6pC6izaD1mQjaaQU/m1awJJ8QSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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