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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47de34d5bb97c80666fe6ce3bda866a0351f5b1be06d8a2d2fa0b4db8f38b96' 
  AND token = 'Ths6d2P6ra9rhys6l063RjYVHfUXtlTO0f1INBr68ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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