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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0d98ad195497dd2d69d4da39070b1a2dc63fb308e0516a57bab983f3bcf7f9' 
  AND token = 'dQ/Vo8vGlkkwPvYmL4K2M9ahndixolDcECyQsLkKOR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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